Improvement in check-valves



j the valve.

UNrEn STATES PATENT OFFICE.

JAMES MORRISON, OF TORONTO, CANADA.

IMPROVEMENT IN CHECK-VALVES.

Sp ecication forming part of Letters Patent No. 151,712, dated June 9,1874; application filed February 21, 1874.

To. all whom it may concern: f Be it known that I, JAMES MORRISON, of

` the city of Toronto, in the county of York,

in the Province of Ontario, Canada, brassfounder, have invented new anduseful Improvements in Check-Valves and l do hereby declare that thefollowing is a full, clear, and accurate description' thereof, wherebyothers skilled in .the art might make and use the same, reference beinghad to the accompanying drawings forming a part of this specification.

This invention relates to the ordinary globevalve, and to the ordinarycheck-valve-that is, it can be used as occasion may require as aglobe-valve-but it relates more especially to the check-valve, uponwhich valve it is an improvement of considerable importance,

when used in connection with the feeding ap- Vsticks up and does notfall on the seat, al-

though it may be of good workmanship. This occurs from various causes,and, when it does stick up, the water rushes back from the boiler andprevents the proper action of the pump; and, in such cases, thecheck-valve has to be examined by taking ofi' the cover and doing whatis found necessary in order to liberate This cannot be done without muchdifficulty, and frequently much delay, unless there is also a separatevalve placed in the aforesaid pipe, viz., a globe-valve, and thissomewhere between the aforesaid check-valve and the boiler, whichglobe-valve, in vsuch cases, would be closed down to prevent the waterrushingback from the boiler while the check-valve was being put inworking condition. My combined adjustable check and globe valve is forthe purpose of overcoming this diiiculty, as it answers the purpose bothas a check and a globe valve, and will be less expensive than the twoseparate valves. My improved valve, however, is desirable in all feedpipes, even when there is a separate globe-valve, as it sometimes hapensthat the globe-valve also gets out of order, when the sole dependence isagain on the check-valve; hence the necessity of having a valve that isthoroughly reliable, and that can be adjusted without difficulty andwithout delay.

In the accompanying drawings, the same letters of reference indicate thesame parts in all the views, and also in the following specificaton.

Figure 1 is a longitudinal sectional elevation, in which the severalparts of the valve are distinctly seen, and will be readily understood.

A is the chamber of the valve. B is the valve-seat; G, theadjusting-stem, which is operated by the hand-wheel W. D is the valve;E, the valve-stem; F, the cap on top of adjusting-stem C.

Fig. 2 is an end elevation, showing most of the parts designated in Fig.1, with the exception of the valve-stem E.

Returning to Fig. l, it will be seen that the adjusting-stem C isoperated, as aforesaid, by the hand-wheel W, and is shown close down onthe back of valve D. In turning the handwheel W backward,`theadjusting-stem C is moved up from the back of the valve D, by which itis liberated and left free to act, and will now act as acheck-valve, andwhile so acting, should the valve' D get fast and cease to act as acheck-valve, it can be moved down, so as to bear slightly on the seat,by means of the adjusting-stein@ and, by unscrewing the cap F, the stemVC can be turned round until the valve is loose. The cap F is thenreplaced and J(he stem C raised up, as before, by the wheel W. The valveD will now be perfectly free and in working condition, the adjustmenthaving been made without difficulty, and also without delay. When usedas a globe-valve, a pin, g, is inserted in stem E on top of stem C. Thecap F constitutes an important feature of my construction, as itprevents the escape of water and steam 5 and there is no stuffing toprevent the stem and valve from rising and falling in the action of theparts as in cheek-valve. The construction, therefore, valve D, stem E,end Gap F, substantieiiy as necessarily differs from that required forshown and described, and for the purposes merely grinding the valve. vhereinbefore set forth. y Having thus described my invention, I JAMESMORRISON. claimv WVitnesses:

The combination of the chamber A, Valve- HENRY NEVILLE,

seat B, adjusting-stem C, with hand-Wheel W, WILLIAMGILL.

